Lifeboat



March 1, 1927.

sQ- SIEURIN LI'FEBOKAT Filed Nov. 9, 19

2 Sheets-Shoot 1 Patented Mar. 1, 1927.

UNITED STATES SVEN A. SIEURIN, OF GOTTENBORG, SWEDEN.

LIFEBOAT.

Application filed November 9, 1925, Serial No. 67,726, and in SwedenJ'anuaryB, 192 5.

g I more specifically to improved means and arrangements for swinging life boats on board ship outvto lowering position. The main object is to simplify the operation and control to the end that the boats may be swung out to lowering position by the use of only a single rope operated by only one man. Another important feature is the provision of improved means for effecting stabilization of.

the boats when ready for embarkation.

The various features of. my invention are shown incorporated. in the structure. illustrated on the accompanying drawing, in which r L Figure 1 is a plan view of a boat and 1ts supporting davit structure showing the normal. or swung-in position;

Figs. 2 and ,3 are similar views showing intermediate positions of the boat;

-Fig. 4 is a similar, view showing the boat in swung-out position ready for lowering;

Figs. 5 and 6 are enlarged fragmentary views ,showing different positions of the operating rope relative to the boat;

Fig. 7 is a sectional view on line 77 of Fig. 5; and 7 Fig. 8 is a side elevational view showing a modified arrangement.-

In the swung-in posit-ion shown in Fig. 1, the life boat 1 and the davits 2 and 3 which are mounted on the ship take the position shown, the operating rope extending from an arm 5 on the davit 3 around the stern 6 and carried along the inwardly turned side of the life boatthrough an eye 8, which eye is detachably fixed to a boss 19 on the side of the boat,-the rope extending through and resting in a fork 9 on the side of the boat and being then carried around the stern 7 and through a sheave 10 to a capstan 15 or the like on the ship (Fig. 8) There are two stops 11 and 12 on the rope for coacting with the fork 9 and the eye 8, respectively. Gther accessories, such as tackles 20 for the lowering of the boat, are shown in Fig. 8.

lVith the above arrangement only one man is required for swinging out a boat to lowering position. After having the boat, lifted from itssupport 17 by ,means of the tackles 20,.it is necessaryonly to operate the rope 4 byapplying ahauling power at the free end of the same; Normally, the stop 11 abuts against the fork '9, so that when pull is applied to the rope, the rope section 4* applies lateral pressure to the stern of the boat,

so that the boat and the davit 2 are swung outwardly to the position shown in Fig. 2. This continues untilthe rope section 4 leaves the stern. Thereafter, the pull on the rope will be exerted by the stop 11 against the fork, and this occurs as soon as'the' rope section 4? assumes the angle- 1 with respect to the boat side as shown in Fig. 6. As soon as released from the fork 9 the rope assumes the position shown by the dotted lines in Fig. 6 andpull on the rope will then be transmitted to the arm 5 on the davit 3, as shown in Fig. 3,, and this davit is swung outwardly to carry the end 6 0f the boat outwardly, the boat assuming the position shown in Fig. 4 as the arm comes practically into alignment with the rope. During swing of the davit 3 the stop 12 on the rope has moved into abutting engagement with the eye 8. This engagement of the rope with the boat will prop the boat against longitudinal swing. For preventing sidewise swing of the boat a rope (not shown) may be fixed to the outer gunwale of the boat and carried under the boat forward to a cleat on the ship deck, in a manner already well known. Thus, a single man. by a single rope is enabled to readily and efficiently swing a life boat from its position on deck into a lowering position, in which position itswill be steadily held. 7

Various modifications can be used without departing from the spirit of the invention.

which a cord or rope 13 is threaded with Then, when the rope is pulled, as by means of the capstan 15, the rope section 4t, together with the cord 13, will become stretched and exert lateral pressure against the stern 7 of the boat to swing it from its position, shown in Fig. 1, to that shown in Fig. 2. Suflicient slack should be permitted in the rope between the stop 11 and the arm 5 to permit the small inward swinging movement of the stern 6 when the stern 7 is started to be swung outwardly. boat has beenswung from the position of Fig. 1 to that of Fig. 2, the cord 13 is manually released from the cleat 14: so that the rope will then'be free to become stretched its entire distance and exert pull on the arm 5 and thus continue the movement of the boat from the position of Fig. 2 to that of Fig. 3 and eventually that of Fig. 4. The stop 12 then comes into engagement with the eye 8 and the boat is locked against swinging movement.

Instead of fasteningthe rope 4 to an arm 5 on the davit 3, the rope can be carried around the vertical part of the davitand fixed to the gunwale of the ship or to the deck at the left. Theboat stern 7 can then be swung out in the manner previously described and then the pulling power will be transmitted to cause the rope to exert lateral pressure against the boat and the stern 6 so that the boat will be pressed outwardly over the shipboard. A single man with a single rope can with this arrangement swing out the life boat, but the davit 3 will probably not turn outward completely and, therefore, the other arrangements previously described are more desirable.

The arrangement can easily bemade such that the rope for each life boat is operated by a common rope or chain applied along the ship or otherwise and actuated by a capstan, so that all the life boats can be simultaneously swung out. The arrangement is also applicable in such cases where several lift boats are placed one above the other, one arm 5 being in this instance provided for each life boat.

Instead of using a fork 9 for co-operating with the rope, other devices such as a crotch, or a hook, or a clamp, or an eye, could be used. The device could be so shaped that it would hold the rope or chain fast so long as the pull is tangential to the boat side, but to release the rope as soon as the rope tries to move away from the boat side when traveling from the position shown in Fig. 2 to that of Fig. 3.

The rope could also be held fast by means of twine which is strong enough tovhold during the swinging-out movement of the boat .end from its position shown in Fig. 1 to that of Fig. 2, but which wouldgive to a stron er pull and break, so that the rope would be released to exert its pulling power on the arm 5.

After the Having described my invention, I claim as follows 1. In combination, two davits, a life boat suspended between them, a rope removably to one of said davits, a sheave provided at the vertical part of the second davit for receiving the other end of said rope, and pulling means connected with such other end of the rope.

2. In combination, two davits, a life boat suspended between them, a rope fixed at one end to one of the davits, acapstan engaging the other end of said rope, a sheave fixed to the other davit engaging said rope be tween the first davit and the capstan, and a fastening device on the inboard side of the life boat removably attached to said rope.

In combination, two davits on board a ship, a life boat suspendedbetween them, a rope fixed at one end to one of said davits, said rope extending along that side of-the boat which is turned to-theship, a sheave fixed to the other davit for receiving said rope, hauling means employed at the free end of said rope, a stop on said rope, and a fastening device on said boat removably engagmg said stop.

4. In combination, two davits on board a ship, a life boat suspended between them, a rope fixed at one end to one of the davits, said rope extending alongthe inboard side of the boat, a sheave fixed to the other davit to receive said rope, hauling means applied to the free end of said rope, a stop on said rope, a fastening device removably engagmg said stop, an eye attachably supported at substantially the middle of the boat, and a stop on that part of the rope which is between the first davit and said eye, said eye being located so that it abuts the stop at the moment the life boat has swung out.

5. In combination, two davits on board a ship, a life boat suspended between them. an arm rigidly fasten-ed to one ofsaid davits and extending practically horizontally in a directionaway from the other davit when the boat is in its swung-in or resting position, a rope fixed at one end to the'free end of said arm, said rope extending .alongthe .inboard side of the boat, a sheave fixed to said other davit for receiving said rope, hauling means applied to the free end of said rope, a stop on said rope, and a fastening device'removably engaging said stop.

6. In combination, two davits on board a ship, a life boat suspended between them, an arm rigidly fastened to one of said davits and extending practically horizontally in a direction away from the other davit when the boat is in its swung-in or resting position, a rope fixed at one end to the free end of'said arm, said rope extending along'the inboard side of the boat, a sheave fixed to said other davit for receiving said rope, hauling means applied to the free end of said rope, a stop on said rope, a fastening device removably engaging; said stop, an eye detachably provided at approximately the middle of the boat, and a stop on that part of the rope which is found between the first davit and the eye, said eye being located so that it abuts the stop at the moment the 10 life boat has swung out.

In Witness whereof, I hereunto subscribe my name this 14th day ofOetober, 1925. SVEN A. SIEURIN. 

